[Linaro-TCWG-CI] gcc-17-3040-gc07fc7b5c698: 2 regressions on aarch64

Dear contributor,

Our automatic CI has detected problems related to your patch(es). Please find some details below.

In bootstrap_check master-aarch64-check_bootstrap, after:
  | commit gcc-17-3040-gc07fc7b5c698
  | Author: Kyrylo Tkachov <[email protected]>
  | Date:   Thu Aug 6 16:29:25 2026 +0200
  | 
  |     match: fold two idioms built from the negation of a value
  |     
  |     X | -X has every bit from the lowest set bit of X upwards, so adding X to
  |     it clears that bit, and masking with it isolates the padding needed to
  |     round X up:
  | ... 52 lines of the commit log omitted.

Produces 2 regressions:
  | 
  | regressions.sum:
  | Running gcc:gcc.dg/tree-ssa/tree-ssa.exp ...
  | FAIL: gcc.dg/tree-ssa/signbit-1.c scan-tree-dump-times optimized " != 0" 3
  | FAIL: gcc.dg/tree-ssa/signbit-1.c scan-tree-dump-times optimized " \\| " 1

Used configuration :
 *CI config* tcwg_bootstrap_check master-aarch64-check_bootstrap
 *configure and test flags:* none, autodetected on aarch64-unknown-linux-gnu

We track this bug report under https://linaro.atlassian.net/browse/GNU-1990. (Require Linaro login) Please let us know if you have a fix.

If you have any questions regarding this report, please ask on [email protected] mailing list.

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The information below contains the details of the failures, and the ways to reproduce a debug environment:

You can find the failure logs in *.log.1.xz files in
 * http://54.172.246.49:9090/jobs/tcwg_bootstrap_check--master-aarch64-check_bootstrap-build/builds/10213/archive/artifacts/00-sumfiles/
The full lists of regressions and improvements as well as configure and make commands are in
 * http://54.172.246.49:9090/jobs/tcwg_bootstrap_check--master-aarch64-check_bootstrap-build/builds/10213/archive/artifacts/notify/
The list of [ignored] baseline and flaky failures are in
 * http://54.172.246.49:9090/jobs/tcwg_bootstrap_check--master-aarch64-check_bootstrap-build/builds/10213/archive/artifacts/sumfiles/xfails.xfail

Current build   : http://54.172.246.49:9090/jobs/tcwg_bootstrap_check--master-aarch64-check_bootstrap-build/builds/10213/archive/artifacts/
Reference build : http://54.172.246.49:9090/jobs/tcwg_bootstrap_check--master-aarch64-check_bootstrap-build/builds/10212/archive/artifacts/

Instruction to reproduce the build : https://gitlab.com/LinaroLtd/tcwg/ci/interesting-commits/-/raw/master/gcc/sha1/c07fc7b5c69884adbfea21c3db08a9583f664377/tcwg_bootstrap_check/master-aarch64-check_bootstrap/reproduction_instructions.txt

Full commit : See in git+ssh://[email protected]/git/gcc.git